Insect around replanted ugli shows charm (7)
I believe the answer is:
beguile
'charm' is the definition.
(synonyms)
'insect around replanted ugli' is the wordplay.
'insect' becomes 'bee' (bee is a kind of insect).
'around' means one lot of letters goes inside another.
'replanted' is an anagram indicator (letters get placed or planted in new positions).
'ugli' anagrammed gives 'guil'.
'bee' going around 'guil' is 'BEGUILE'.
'shows' is the link.
(Other definitions for beguile that I've seen before include "Fascinate" , "Win the attention of, charm" , "Charm, divert" , "Charm, enchant" , "Charm, entrance" .)